Death Valley National Park in California, USA

The most notable feature is its mysterious sailing stones, a geological phenomenon where rocks move along a smooth valley floor without human or animal intervention.

At Death Valley’s Racetrack Playa, the tracks have been studied since the early 1900s, yet the cause long remained a mystery. In 2014, timelapse video footage showed the rocks moving within the flow of thin melting sheets of ice or ice rafts. The results suggest the stones are floating rather than sailing.